How to cook a magnetic rod made of lithium carbonate as a magnetic foreign body after it is used up?

When the magnetic rod made of lithium carbonate as a magnetic foreign matter is used up, it should be put into a large container, and enough water should be added to control the temperature of lithium carbonate below the boiling point of magma ice (about 293 degrees Celsius), and then the lithium carbonate is completely removed by electrochemical oxidation with the cathode until all the lithium carbonate in it is oxidized into carbon dioxide.